Siemens
Sister brand to Bosch, built on the same platforms, so faults, parts and error codes are closely related. Typical repair cost for a Siemens microwave: £60–£140.
Most Siemens microwave repairs cost £60–£140 including parts and labour. Prices depend on the fault and parts availability.
On a cheap countertop microwave, replacement is often cheaper than any repair. On built-in and combination microwaves, repairing is usually better value.
The model and serial number are on a rating plate — typically inside the door frame, on the back panel, or inside the fridge on the side wall. Quote it when booking a repair so the engineer brings the right parts.